CN117962360A - Forming device and forming method - Google Patents
Forming device and forming method Download PDFInfo
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- CN117962360A CN117962360A CN202410291789.4A CN202410291789A CN117962360A CN 117962360 A CN117962360 A CN 117962360A CN 202410291789 A CN202410291789 A CN 202410291789A CN 117962360 A CN117962360 A CN 117962360A
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- cover plate
- density
- male die
- needled felt
- core barrel
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 72
- 238000000465 moulding Methods 0.000 claims description 72
- 239000000463 material Substances 0.000 claims description 32
- 239000004744 fabric Substances 0.000 claims description 22
- 239000010453 quartz Substances 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000009966 trimming Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 18
- 239000005011 phenolic resin Substances 0.000 description 18
- 229920001568 phenolic resin Polymers 0.000 description 18
- 239000012779 reinforcing material Substances 0.000 description 13
- 239000003292 glue Substances 0.000 description 10
- 238000009745 resin transfer moulding Methods 0.000 description 8
- 239000002131 composite material Substances 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 6
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000002679 ablation Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000001721 transfer moulding Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 needled felt Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The application discloses a forming device and a forming method. The first cover plate, the second cover plate, the male die splice blocks and the female die splice blocks are assembled to form the forming device, and as the core barrel is gradually increased along the barrel diameter far away from the first cover plate, the thickness of the male die splice blocks is gradually reduced along the direction far away from the first cover plate, at least one male die splice block can be disassembled to enable the position of the disassembled male die splice blocks to provide buffer space for reinforcing fibers, so that the reinforcing fibers are smoothly and conveniently sleeved on the periphery of the male die splice blocks, the thin ends of the disassembled male die splice blocks are inserted into the buffer space, the male die splice blocks are gradually pressurized by utilizing the taper of the core barrel until the disassembled male die splice blocks are in place, so that the reinforcing fibers are attached to the male die, the reinforcing fibers are prevented from being torn and damaged, and the quality of a formed product is improved.
Description
Technical Field
The application belongs to the technical field of composite material preparation, and particularly relates to a forming device and a forming method.
Background
The RTM molding (Resin TransferMolding ) process is a common process method used in the manufacture of composite materials. The basic principle of RTM is that the glass fiber reinforced material is laid in the mold cavity of a closed mold, resin glue solution is injected into the mold cavity by pressure, the glass fiber reinforced material is soaked, and then the glass fiber reinforced material is solidified and the molded product is demolded.
When the RTM technology forms an oval column section structure, reinforcing fibers are die-filled to the tool, and because the reinforcing materials are light and soft, when the reinforcing materials are attached to the tool by external force, the reinforcing materials can be torn and damaged, and the quality of a formed product is affected.
Disclosure of Invention
The application provides a forming device and a forming method for solving the technical problem that in the related art, reinforcing materials are torn and damaged due to the fact that reinforcing materials are attached to a tool by external force.
A first aspect of the present application provides a molding apparatus, comprising:
a first cover plate;
The core barrel is detachably arranged on the first cover plate, the barrel diameter of the core barrel along the preset direction is gradually increased, and the preset direction is perpendicular to the first cover plate and far away from the first cover plate;
The male die splicing blocks are detachably arranged on the periphery of the core barrel in sequence and respectively attached to the outer side wall of the core barrel to form male dies;
the female die splicing blocks are sequentially arranged on the periphery of the male die in a surrounding mode to form female dies, the female dies are spaced from the male die, and the female dies are detachably connected with the first cover plate;
The second cover plate is located the core barrel is kept away from the one end of first cover plate, and with core barrel and many the die piece can dismantle the connection, first cover plate second cover plate, many the terrace die piece and many the die piece enclose to establish and form the die cavity, first cover plate or offer on the second cover plate and be used for carrying the conveying hole of curing material, the conveying hole with the shaping cavity intercommunication.
In some embodiments, the second cover plate is provided with a mounting groove, and one end of the male die assembly, which is far away from the first cover plate, is inserted into the mounting groove.
In some embodiments, the molding apparatus further comprises:
and the male die retainer ring is detachably connected with the first cover plate and is positioned on the periphery side of the core barrel, and one end, far away from the second cover plate, of the male die splicing block is positioned between the core barrel and the male die retainer ring.
A second aspect of the present application provides a molding method applied to the molding apparatus described above, the molding method including:
placing the first cover plate on the assembly platform;
sequentially assembling a core barrel, a male die retainer ring, a plurality of male die blocks, a plurality of female die blocks and a second cover plate on the first cover plate to form a forming device, wherein the second cover plate, the first cover plate, the plurality of male die blocks and the plurality of female die blocks are surrounded to form a forming cavity;
Turning over the forming device and placing the second cover plate on the assembling platform;
disassembling the first cover plate, the male die retainer ring, a plurality of female die blocks and at least one male die block;
Manufacturing reinforcing fibers, and sleeving the reinforcing fibers on the peripheral sides of the remaining male die blocks;
Installing the disassembled male die splice in place;
mounting the disassembled multiple female die blocks and the first cover plate in place;
conveying a curing material into the forming cavity through a conveying hole, wherein the conveying hole is formed in the first cover plate or the second cover plate, and the curing material and the reinforcing fiber are cured to form a column structure;
And taking the column structure out of the forming cavity of the forming device.
In some embodiments, the making the reinforcing fiber comprises:
disposing a needled felt of a first density on the outer layer;
The needled felt with the second density is arranged in the machine, the density of the needled felt with the first density is higher than that of the needled felt with the second density, and the needled felt with the first density and the needled felt with the second density are respectively in needled felt structures and are connected by adopting Z-direction needling;
and inserting quartz cloth into the needled felt with the first density and the needled felt with the second density at intervals, and constructing the needled felt with the first density, the needled felt with the second density and the quartz cloth to form the reinforced fibers.
In some embodiments, after the plurality of pieces of the female die segments and the first cover plate are assembled in place, the method comprises:
disassembling a plurality of female die blocks and the first cover plate for a preset time period;
Repairing the needling at the folds of the reinforcing fibers by adopting a net tire, and cutting and trimming the redundant positions of the reinforcing fibers;
And installing the disassembled multiple female die blocks and the first cover plate in place.
In some embodiments, the first density needled felt has a density of 0.3g/cm 3 to 0.35g/cm 3, the second density needled felt has a density of 0.2g/cm 3 to 0.25g/cm 3, and the quartz cloth has a thickness of 0.06mm to 0.2mm.
In some embodiments, the cured material is a hybrid resin having a density of 0.3g/cm 3 to 0.45g/cm 3.
In some embodiments, the delivering the solidified material into the forming cavity through the delivery aperture includes:
injecting the hybrid resin into the molding cavity through the conveying hole at the temperature of 20-40 ℃ and the pressure of 0.05-0.15 MPa.
In some embodiments, the removing the cylinder structure from within the molding cavity of the molding device comprises:
Turning over the forming device, and placing the first cover plate on the assembling platform;
disassembling the second cover plate, the female die splice pieces and the core barrel;
Moving a plurality of said male mold segments inwardly until disengaged from said cylinder structure;
and taking out the column structure.
According to one or more embodiments of the present application, a molding apparatus and a molding method are provided, the molding apparatus includes a first cover plate, a core barrel, a multi-piece male mold segment, a multi-piece female mold segment, and a second cover plate. The first cover plate, the second cover plate, the male die splice blocks and the female die splice blocks are assembled to form the forming device, and as the core barrel is gradually increased along the barrel diameter far away from the first cover plate, the thickness of the male die splice blocks is gradually reduced along the direction far away from the first cover plate, at least one male die splice block can be disassembled to enable the position of the disassembled male die splice blocks to provide buffer space for reinforcing fibers, so that the reinforcing fibers are smoothly and conveniently sleeved on the periphery of the male die splice blocks, the thin ends of the disassembled male die splice blocks are inserted into the buffer space, the male die splice blocks are gradually pressurized by utilizing the taper of the core barrel until the disassembled male die splice blocks are in place, so that the reinforcing fibers are attached to the male die, the reinforcing fibers are prevented from being torn and damaged, and the quality of a formed product is improved.
Drawings
FIG. 1 is a schematic diagram of a molding apparatus according to one or more embodiments of the present application;
FIG. 2 is a schematic view of a molding apparatus (omitting two die segments) in one or more embodiments of the application;
FIG. 3 is a schematic view of a molding apparatus (omitting a die block and a second cover plate) according to one or more embodiments of the present application;
FIG. 4 is a schematic view of a molding apparatus (omitting the female mold segment and the second cover plate and one of the male mold segments) according to one or more embodiments of the present application;
FIG. 5 is a schematic cross-sectional view of a molding apparatus according to one or more embodiments of the present application;
FIG. 6 is a schematic cross-sectional view of another angle of a molding apparatus in one or more embodiments of the application;
FIG. 7 is a flow chart of a molding method in one or more embodiments of the application.
Reference numerals illustrate:
10. a first cover plate; 20. a core barrel; 30. a male die block; 40. splicing the female die; 50. a second cover plate; 60. an elliptical column section structure; 70. forming a cavity; 80. a male die retainer ring.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The RTM molding (Resin TransferMolding ) process is a common process method used in the manufacture of composite materials. The basic principle of RTM is that the glass fiber reinforced material is laid in the mold cavity of a closed mold, resin glue solution is injected into the mold cavity by pressure, the glass fiber reinforced material is soaked, and then the glass fiber reinforced material is solidified and the molded product is demolded.
In the related art, when the RTM process forms the oval pillar section structure 60, the reinforcing fibers are molded into the tooling. In order to ensure the apparent quality of the molded product, the size of the reinforcing fiber and the size of the tooling have a tight fit tolerance, and the fit tolerance is usually 0.3mm to 0.5mm. Under the influence of the shape structure of the elliptical column section structure 60, certain external force needs to be applied in the process of transferring and installing the reinforcing fibers to the tool, so that the axial and radial positions of the reinforcing fibers are consistent with those of the tool. Because the density of the reinforcing material is low, the reinforcing material is light and soft, and when the reinforcing material is attached to the tool by external force, the reinforcing material can be torn and damaged, and the quality of a formed product is affected.
The application provides a forming device and a forming method for solving the technical problem that in the related art, reinforcing materials are torn and damaged due to the fact that reinforcing materials are attached to a tool by external force.
In a first aspect of the present application, referring to fig. 1 to 3, a molding device is provided for molding an elliptical column segment structure 60 by using an RTM process, where the elliptical column segment structure 60 is hollow and cylindrical. The molding device comprises a first cover plate 10, a core barrel 20, a male die block 30, a female die block 40 and a second cover plate 50.
The first cover plate 10 is used as a mounting base, and the first cover plate 10 is rectangular plate-shaped, so that the contact area between the first cover plate 10 and an assembly platform can be increased, and the stability of the forming device is improved.
The core barrel 20 is in a barrel shape, a first threaded hole is formed in one end of the core barrel 20, a first through hole (not shown in the figure) is formed in the first cover plate 10, a screw is in threaded connection with the first threaded hole on the core barrel 20 through the first through hole (not shown in the figure), the core barrel 20 is detachably mounted on the first cover plate 10, and the axis of the core barrel 20 is perpendicular to the plane where the first cover plate 10 is located.
The male die assembly 30 is plate-shaped and provided with a plurality of pieces, and the plurality of pieces of male die assembly 30 are sequentially and detachably arranged on the periphery side of the core barrel 20 and respectively attached to the outer side wall of the core barrel 20 to form male dies. Referring to fig. 3, the male mold half 30 may be provided with eight pieces, and the eight male mold half 30 may have different structural shapes according to the fitting positions of the male mold half 30 and the core barrel 20. In some embodiments, the number and structural shape of the male mold segments 30 may be set according to the shape of the molded product and the shape of the core barrel 20, and the present application is not limited thereto.
The female die assembly 40 is plate-shaped and provided with a plurality of female die assemblies 40, and the female die assemblies 40 are sequentially arranged on the periphery of the male die in a surrounding manner to form female dies which are spaced from the male die. Because the first cover plate 10 is rectangular, the female die splice 40 can be provided with four pieces, the end of the female die splice 40 close to the first cover plate 10 is provided with a first notch (not shown in the figure), and the edge of the first cover plate 10 can be directly clamped in the first notch, so that the connection tightness between the female die splice 40 and the first cover plate 10 is improved. A second through hole (not shown in the figure) is formed in the first notch position of the first cover plate 10, a second threaded hole (not shown in the figure) is formed in the edge of the first cover plate 10, and a screw is connected with the second threaded hole on the first cover plate 10 through the second through hole, so that the female die splicing block 40 is detachably mounted on the first cover plate 10, and the connection stability between the female die splicing block 40 and the first cover plate 10 is improved.
The second cover plate 50 is a rectangular cover plate, is located at one end of the core barrel 20 away from the first cover plate 10, is detachably connected with the core barrel 20 and the female die splicing blocks 40, and is provided with a third through hole (not shown in the figure) at a position corresponding to the second cover plate 50 and the core barrel 20, and is provided with a third threaded hole (not shown in the figure) at one side of the core barrel 20 away from the first cover plate 10, and a screw is connected with the third threaded hole on the core barrel 20 through the third through hole, so that the second cover plate 50 is detachably mounted on the core barrel 20.
A second notch (not shown in the figure) is formed in the position, corresponding to the second cover plate 50, of the female die assembly block 40, and the edge of the second cover plate 50 can be directly clamped in the second notch, so that the connection tightness between the second cover plate 50 and the female die assembly block 40 is improved. A fourth through hole (not shown in the figure) is formed in a position, corresponding to the second notch, of the second cover plate 50, a fourth threaded hole (not shown in the figure) is formed in one side, away from the second cover plate 50, of the female die splicing block 40, and a screw is connected with the fourth threaded hole through the fourth through hole in the second cover plate 50, so that connection stability between the female die splicing block 40 and the second cover plate 50 is improved.
It should be noted that, the core barrel 20 may be detachably connected to the first cover plate 10 and the second cover plate 50 by other manners, such as clamping, and the female die assembly 40 may be detachably connected to the first cover plate 10 and the second cover plate 50 by other manners, such as clamping, and may be set according to actual needs, which is not limited by the present application.
Referring to fig. 1 to 3, a first cover plate 10, a second cover plate 50, a plurality of male mold blocks 30 and a plurality of female mold blocks 40 are assembled into a forming device, a forming cavity 70 is formed by surrounding the first cover plate 10, the second cover plate 50, the plurality of male mold blocks 30 and the plurality of female mold blocks 40 in the forming device, a conveying hole (not shown) is formed in the first cover plate 10 and is communicated with the forming cavity 70, a curing material can be conveyed into the forming cavity 70 through the conveying hole, and the curing material and reinforcing fibers in the forming cavity 70 are cured to form an oval column section structure 60.
In some embodiments, the conveying hole may be formed in the second cover 50, and may be set according to practical requirements, which is not limited by the present application.
Before delivering the curing material into the forming cavity 70, the reinforcing fibers need to be sleeved around the periphery of the multi-piece male die segment 30 and positioned in the forming cavity 70, and then the curing material is delivered into the forming cavity 70 and cured with the reinforcing fibers to form the oval-shaped post segment structure 60.
The oval column segment structure 60 is a regular column and is formed between the male mold segments 30 and the female mold segments 40, so that the side wall of the male mold segment 30 away from the core barrel 20 and the side wall of the female mold segment 40 close to the male mold segment 30 are perpendicular to the first cover plate 10 respectively.
Referring to fig. 4 to 6, since the diameter of the core barrel 20 is gradually increased along the preset direction, the preset direction is perpendicular to the first cover plate 10 and is far away from the first cover plate 10, and the thickness of the male die assembly 30 along the direction far away from the first cover plate 10 is gradually reduced, when the reinforcing fiber is sleeved on the periphery of the plurality of male die assemblies 30, the assembled forming device can be turned over, the second cover plate 50 is placed on the assembling platform, the first cover plate 10, the plurality of female die assemblies 40 and at least one male die assembly 30 are disassembled, and the reinforcing fiber is sleeved on the periphery of the remaining seven male die assemblies 30. The position of detaching one male die splice block 30 on the male die can provide a buffer space for reinforcing fibers, so that the reinforcing fibers can be smoothly and conveniently sleeved on the periphery of seven male die splice blocks 30, the thin end of the detached male die splice block 30 is inserted into the buffer space, the male die splice block 30 is gradually pressurized by utilizing the taper of the core barrel 20, the detached male die splice block 30 is in place, the reinforcing fibers are attached to the male die, the reinforcing fibers are prevented from being torn and damaged, and the quality of a formed product is improved.
It should be noted that, the assembled molding device can disassemble the multiple (two or three) male mold segments 30 at the same time, and the position of disassembling the multiple male mold segments 30 on the male mold can provide a buffer space for the reinforcing fibers.
After the reinforcing fibers are in place, the disassembled first cover plate 10 and the disassembled plurality of female die segments 40 can be assembled, and then the cured material can be transferred to the forming cavity 70 to cure the cured material and reinforcing fibers into the oval column segment structure 60.
Since the reinforcing fibers are sleeved on the periphery of the male mold segment 30, the molding device needs to be turned over for multiple times, and in order to prevent the positions of the male mold segment 30 and the female mold segment 40 from moving during the turning of the molding device, the second cover plate 50 is provided with a mounting groove (not shown in the figure), and one end of the male mold segment 30, which is far away from the first cover plate 10, is inserted into the mounting groove. Referring to fig. 4 to 6, the forming device further includes a male mold retainer 80 detachably connected to the first cover plate 10 and located on the peripheral side of the core barrel 20, and one end of the male mold segment 30 away from the second cover plate 50 is located between the core barrel 20 and the male mold retainer 80, so that positions of the male mold segment 30 and the female mold segment 40 can be defined, dimensional accuracy of the forming cavity 70 is ensured, and forming quality of the oval column segment structure 60 is improved.
It should be noted that the convex film retainer ring may be detachably connected with the first cover plate 10, or may be integrally formed with the first cover plate 10, and may be set according to actual requirements, which is not limited by the present application.
In a second aspect of the present application, referring to fig. 1 to 7, a molding method is provided, and the molding method includes:
S202, placing the first cover plate 10 on the assembly platform.
S204, sequentially assembling the core barrel 20, the male die retainer 80, the plurality of male die blocks 30, the plurality of female die blocks 40 and the second cover plate 50 on the first cover plate 10 to form a forming device, and enclosing the second cover plate 50, the first cover plate 10, the plurality of male die blocks 30 and the plurality of female die blocks 40 to form a forming cavity 70.
S206, turning over the forming device, and placing the second cover plate 50 on the assembly platform.
S208, the first cover plate 10, the male die retainer 80, the plurality of female die segments 40 and at least one male die segment 30 are disassembled.
S210, manufacturing reinforcing fibers, and sleeving the reinforcing fibers on the peripheral sides of the remaining multi-piece male die blocks 30.
The manufacturing reinforcing fiber in S210 specifically includes:
s302, arranging the needled felt with the first density on the outer layer.
S304, arranging the needled felt with the second density in the interior, wherein the density of the needled felt with the first density is greater than that of the needled felt with the second density, and the needled felt with the first density and the needled felt with the second density are respectively in needled felt structures and are connected by adopting Z-direction needling.
S306, inserting quartz cloth into the needled felt with the first density and the needled felt with the second density at intervals, and constructing the needled felt with the first density, the needled felt with the second density and the quartz cloth to form the reinforced fiber.
The reinforced fibers are quartz needled felt cloth and are of a gradient structure, the needled felt of the first density is 0.3g/cm 3 to 0.35g/cm 3, the needled felt positioned on the outer layer of the formed elliptic column section structure 60 is high in density, and the strength and ablation resistance of the elliptic column section structure 60 are improved; the density of the needled felt with the second density is 0.2g/cm 3 to 0.25g/cm 3, so that the density of the needled felt positioned in the oval column section structure 60 is low, and the high-efficiency heat insulation requirement of the oval column section structure 60 is met; wherein the density of the net tread (according to the thickness requirement of the product, the net tread is realized by overlapping and accumulating a plurality of layers of net treads, and the connection between the plurality of layers of net treads is realized by needling, so that the integrated structure of the product is realized) is 45g/cm 3 to 85g/cm 3. The density of the needled felt of the inner layer and the outer layer of the reinforcing fiber is controlled between 0.2g/cm 3 and 0.35g/cm 3, the light weight of the needled felt is improved, the strength of the needled felt can be ensured, and the light weight of the reinforcing fiber and the strength of the reinforcing fiber are further improved. When the density of the needled felt is less than 0.2g/cm 3, the strength of the reinforcing fibers, and thus the strength of the formed elliptical pillar segment structure 60, cannot be ensured, and thus the ablation resistance of the elliptical pillar segment structure 60 cannot be ensured.
The needled felt and the quartz cloth can be connected to form the reinforcing fiber with thin thickness (0.08 mm to 0.1 mm) and high strength (the breaking strength is more than 1000N), so that the strength of the reinforcing fiber is higher than 40MPa, and the strength of the reinforcing fiber can be improved, and the overall strength of the formed elliptic column section structure 60 is further improved.
The quartz cloth can be woven into plain quartz cloth, twill quartz cloth or satin quartz cloth by using B-type quartz yarns or C-type quartz yarns or D-type quartz yarns, and the weaving thickness is 0.06mm to 0.2mm. The thickness of the quartz cloth is 0.06mm to 0.2mm in the needled felt (comprising the needled felt with the first density and the needled felt with the second density), so that the integral strength of the reinforced fiber can be improved.
S212, mounting the detached male die assembly 30 in place.
S214, mounting the disassembled multi-piece female die splice 40 and the first cover plate 10 in place.
Because the cylinder diameter of the core barrel 20 along the preset direction is gradually increased, the preset direction is perpendicular to the first cover plate 10 and is far away from the first cover plate 10, the thickness of the male die splice block 30 along the direction far away from the first cover plate 10 is gradually reduced, and then at least one male die splice block can be disassembled to ensure that the position of the disassembled male die splice block provides a buffer space for reinforcing fibers, so that the reinforcing fibers are smoothly and conveniently sleeved on the periphery of the male die splice blocks, then the thin ends of the disassembled male die splice blocks are inserted into the buffer space, the male die splice blocks gradually pressurize the reinforcing fibers by utilizing the taper of the core barrel until the disassembled male die splice blocks are in place to ensure that the reinforcing fibers are attached to the male die, thereby preventing the reinforcing fibers from tearing and damaging, and improving the quality of molded products.
S214 may further include:
s402, disassembling the female die splice blocks 40 and the first cover plate 10 for a preset time period.
The reinforcing fibers are installed in the forming cavity 70 and sleeved on the periphery of the male mold blocks 30, the disassembled female mold blocks 40 and the first cover plate 10 are installed in place in a clockwise or anticlockwise order, and the forming device is assembled completely. The reinforcing fibers are pre-pressed and finally set in the forming cavity 70 of the forming device.
The connection position between the side contacts of two adjacent male mold segments 30 of the molding device is lined with a skin along the axial direction of the molding device, which is used to prevent the extrusion damage of the fabric by the mold splice seam position during the mold closing process. The connecting position between the two female die splicing blocks 40 can also be padded with a skin along the axis of the forming device, the thickness of the skin is 0.4mm to 0.6mm, the size and the appearance of the reinforcing fibers can be controlled by using the skin, the accuracy of the size of the reinforcing fibers is ensured, and the forming quality of the elliptic column section structure 60 is improved.
The forming means is of a rigid material such as steel, iron and the like. The reinforcing fiber (including needled felt, quartz cloth, etc.) has soft texture and a compression ratio of about 1mm. If the thickness of the skin is greater than 0.6mm, the needled felt cannot be compacted; if the thickness of the skin is less than 0.4mm, the extrusion force is excessive to damage the reinforcing fibers.
S406, repairing the needling at the folds of the reinforcing fibers by adopting the net tire, and cutting and trimming the redundant positions of the reinforcing fibers.
S408, the disassembled multi-piece female die segments 40 and the first cover plate 10 are installed in place.
S216, conveying the curing material into the forming cavity 70 through a conveying hole, wherein the conveying hole is formed in the first cover plate or the second cover plate, and the curing material and the reinforcing fiber are cured to form a cylinder structure.
In order to reduce the overall density of the formed elliptical column segment structure 60, the weight reduction of the elliptical column segment structure 60 is improved. The curing material is selected from one of hybridized phenolic resin, and selected light phenolic resin such as hybridized phenolic resin HP-4, PF30, PF45, FAM and the like. The molded oval column section structure 60 is a phenolic resin-based heat protection material, and the phenolic resin-based heat protection material has good manufacturability, wide temperature range adaptability and excellent heat insulation resistance, and is a preferred material for future aircraft heat protection. The oval column section structure 60 is used as a phenolic resin-based heat protection material, and the light-weight level of the oval column section structure 60 can be improved by reducing the overall density of the oval column section structure 60; while also reducing the cost of production by reducing the density of the oval column segment structure 60. By controlling the strength of the outer layer of the oval column section structure 60, the heat insulation performance of the oval column section structure 60 is improved.
The porous light structure (nano-pore hybridized phenolic composite material) of the oval column section structure 60 is formed by releasing the hybridized phenolic resin after solidification of small molecules, the density of the hybridized phenolic resin is 0.3g/cm 3 to 0.45g/cm 3, so that the density of the oval column section structure 60 can be reduced, the light weight of the oval column section structure 60 is improved, and meanwhile, the strength of the oval column section structure 60 is ensured. If the hybrid phenolic resin density is less than 0.3g/cm 3, the adhesion performance and the ablation resistance of the elliptical column segment structure 60 are sacrificed; the density of the hybridized phenolic resin is greater than 0.45g/cm 3, so that the density of the oval column section structure 60 can be increased, and the weight reduction of the oval column section structure 60 is affected.
The hybridized phenolic resin is injected into the molding cavity 70 in the temperature environment of 20-40 ℃, and the pressure is controlled to be 0.05-0.15 MPa, and as the reinforcing material is soft in texture and good in wettability to the reinforcing material under the low-pressure (0.05-0.15 MPa) environment, the hybridized phenolic resin is uniformly filled into the molding cavity 70, and the uniformity and consistency of the oval column section structure 60 are improved. If the glue injection pressure is greater than 0.15MPa, the surface of the reinforcing fiber is impacted, so that the reinforcing fiber is wrinkled and shifted, and the molding quality of the elliptical column segment structure 60 is affected.
And (3) curing the hybridized phenolic resin in the molding cavity 70 after the glue injection is completed, wherein the curing temperature is raised to 100 ℃ from room temperature, and cooling to not higher than 60 ℃ and demolding after the curing heat preservation (12-24 h) is completed.
And S218, taking the column structure out of the molding cavity 70 of the molding device.
S218 specifically includes:
S502, the forming device is turned over, and the first cover plate 10 is placed on the assembly platform.
S504, the second cover plate 50, the multi-piece female die assembly 40 and the core barrel 20 are disassembled.
It should be noted that, after the injection is completed, the plurality of female die segments 40 can be disassembled, the oval column section structure 60 is dried, the step temperature is adopted for drying, and the highest temperature is not more than 80 ℃.
S506, the multi-piece male mold segment 30 is moved inwards until the multi-piece male mold segment is separated from the cylinder structure.
S508, taking out the column structure. After the oval column section structure 60 is taken out, flash and glue overflow on the outer end surface of the oval column section structure 60 can be polished and cleaned, and the apparent mass of the oval column section structure 60 is improved. The density of the obtained oval column section structure 60 (composite material) is 0.6g/cm 3 -0.65 g/cm 3, the strength is more than or equal to 40MPa, the thermal conductivity (200 ℃) is less than or equal to 0.08W/(m.K), and the ablation resistance is achieved, so that the light weight level and the heat insulation performance of the oval column section structure 60 (phenolic resin-based heat protection material) are improved, and meanwhile, the production cost is reduced.
The oval column section structure 60 adopts an RTM glue injection molding process, the appearance of the molded oval column section structure 60 can ensure the net size through a molding device, the damage and the environmental pollution of the mechanical processing to the oval column section structure 60 are reduced, the molding period of the oval column section structure 60 can be saved, and the production cost is reduced.
The forming process of the oval column section structure 60 (phenolic resin based thermal protection material) includes:
(1) A textile structure (reinforcing fibers) is produced.
According to the model size of the oval column segment structure 60, make 1:1 mould. Along the thickness direction of the oval column section structure 60, the outer layer adopts a high-density needled felt (0.3 g/cm 3 to 0.35g/cm 3), the inside adopts a low-density needled felt (0.2 g/cm 3 to 0.25g/cm 3), the inside and the outside are of needled felt structures and are connected by Z-direction needling, and quartz cloth penetration intervals with the thickness of 0.06 to 0.2mm are adopted in the needled felt.
(2) Manufacturing a tooling structure (forming device).
The molding device comprises a first cover plate 10, a second cover plate 50, a male die block 30, a female die block 40, a core barrel 20 and a male die retainer 80.
When the reinforced fiber of the elliptic column section structure 60 is molded, the first cover plate 10 is placed on an assembling platform, and the molding device is integrally assembled; the forming device is then flipped over and the second cover plate 50 is placed on the assembly platform. Removing the female die splice 40, the first cover plate 10 and one of the male die splice 30; reinforcing fibers are sleeved on the periphery of the male die splice blocks 30; and finally, the disassembled male die assembly 30 is attached to the core barrel 20 and slowly falls down until the assembly is completed, so that the forming device is assembled again.
(3) Tool structure (forming device) cleaning.
The molding surface (for enclosing the molding cavity 70) of the molding device is cleaned and dried.
(4) The fabric structure (reinforcing fiber) was tried on.
The reinforcing fibers are sleeved on the periphery of the male die splice blocks 30, the forming device is assembled according to the clockwise or anticlockwise sequence, and the reinforcing fibers are pre-pressed and finally shaped.
(5) Cutting and trimming.
After the fabric structure (reinforcing fibers) is loaded into the molding device, the mold is closed and pre-pressed for 2 to 3 hours. And then opening the mould, checking the flatness of the fabric structure (reinforcing fiber), repairing and needling the fine wrinkles of the reinforcing fiber by adopting a net tire, and cutting and trimming the redundant positions.
(6) And (5) die assembly.
The molding device is provided with a sealing rope to ensure the tightness of the molding cavity 70 in the molding device.
The molding surface of the molding device (for enclosing the molding cavity 70) needs to be adhered with a release cloth or sprayed with a release agent, and the tightness of the molding device is detected after the mold is closed.
(7) Resin is selected.
One of low-density hybridized phenolic resin HP-4, PF30, PF45 and FAM is selected
(8) And (5) injecting glue.
The hybrid phenolic resin is injected into the molding cavity 70 in a temperature environment of 20 ℃ to 40 ℃ and the pressure is controlled to be 0.05MPa to 0.15MPa.
(9) And (5) curing.
And (3) curing the hybridized phenolic resin in the molding cavity 70 after the glue injection is completed, wherein the curing temperature is raised to 100 ℃ from room temperature, and cooling to not higher than 60 ℃ and demolding after the curing heat preservation (12-24 h) is completed.
(10) And (5) drying treatment.
After the glue injection is completed, the female die blocks 40 can be disassembled, the oval column section structure 60 (composite material) is dried, the step temperature is adopted for drying, and the highest temperature is not more than 80 ℃.
(11) And (5) demolding.
After the drying is completed, the molding device is turned over, and the first cover plate 10 is placed on the assembly platform. The second cover plate 50, the plurality of female die segments 40 and the core barrel 20 are disassembled. The multi-piece male die segments 30 are moved inwardly until disengaged from the oval post segment structure 60 and the oval post segment structure 60 is removed.
(12) The surface of the oval pillar segment structure 60 is polished.
And (5) polishing and cleaning the flash and glue overflow on the outer end surface of the oval column section structure 60.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" indicate orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
In the present application, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A molding apparatus, characterized in that the molding apparatus comprises:
a first cover plate;
The core barrel is detachably arranged on the first cover plate, the barrel diameter of the core barrel along the preset direction is gradually increased, and the preset direction is perpendicular to the first cover plate and far away from the first cover plate;
The male die splicing blocks are detachably arranged on the periphery of the core barrel in sequence and respectively attached to the outer side wall of the core barrel to form male dies;
The female die splicing blocks are sequentially arranged on the periphery of the male die in a surrounding mode to form female dies, the female dies are spaced from the male die, and the female dies are detachably connected with the first cover plate;
The second cover plate is located the core barrel is kept away from the one end of first cover plate, and with core barrel and many the die piece can dismantle the connection, first cover plate second cover plate, many the terrace die piece and many the die piece enclose to establish and form the die cavity, first cover plate or offer on the second cover plate and be used for carrying the conveying hole of curing material, the conveying hole with the shaping cavity intercommunication.
2. The molding apparatus of claim 1, wherein said second cover plate defines a mounting slot, and wherein an end of said male mold segment remote from said first cover plate is inserted into said mounting slot.
3. The molding apparatus of claim 2, wherein the molding apparatus further comprises:
and the male die retainer ring is detachably connected with the first cover plate and is positioned on the periphery side of the core barrel, and one end, far away from the second cover plate, of the male die splicing block is positioned between the core barrel and the male die retainer ring.
4. A molding method applied to the molding apparatus of claims 1 to 3, characterized in that the molding method comprises:
placing the first cover plate on the assembly platform;
sequentially assembling a core barrel, a male die retainer ring, a plurality of male die blocks, a plurality of female die blocks and a second cover plate on the first cover plate to form a forming device, wherein the second cover plate, the first cover plate, the plurality of male die blocks and the plurality of female die blocks are surrounded to form a forming cavity;
Turning over the forming device and placing the second cover plate on the assembling platform;
disassembling the first cover plate, the male die retainer ring, a plurality of female die blocks and at least one male die block;
Manufacturing reinforcing fibers, and sleeving the reinforcing fibers on the peripheral sides of the remaining male die blocks;
Installing the disassembled male die splice in place;
mounting the disassembled multiple female die blocks and the first cover plate in place;
conveying a curing material into the forming cavity through a conveying hole, wherein the conveying hole is formed in the first cover plate or the second cover plate, and the curing material and the reinforcing fiber are cured to form a column structure;
And taking the column structure out of the forming cavity of the forming device.
5. The molding method of claim 4, wherein said making reinforcing fibers comprises:
disposing a needled felt of a first density on the outer layer;
The needled felt with the second density is arranged in the machine, the density of the needled felt with the first density is higher than that of the needled felt with the second density, and the needled felt with the first density and the needled felt with the second density are respectively in needled felt structures and are connected by adopting Z-direction needling;
and inserting quartz cloth into the needled felt with the first density and the needled felt with the second density at intervals, and constructing the needled felt with the first density, the needled felt with the second density and the quartz cloth to form the reinforced fibers.
6. The molding method of claim 4, wherein said mounting said plurality of said female mold halves and said first cover plate in place comprises:
disassembling a plurality of female die blocks and the first cover plate for a preset time period;
Repairing the needling at the folds of the reinforcing fibers by adopting a net tire, and cutting and trimming the redundant positions of the reinforcing fibers;
And installing the disassembled multiple female die blocks and the first cover plate in place.
7. The molding method of claim 5, wherein the first density needled felt has a density of 0.3g/cm 3 to 0.35g/cm 3, the second density needled felt has a density of 0.2g/cm 3 to 0.25g/cm 3, and the quartz cloth has a thickness of 0.06mm to 0.2mm.
8. The molding method according to claim 7, wherein the cured material is a hybrid resin having a density of 0.3g/cm 3 to 0.45g/cm 3.
9. The molding method of claim 8, wherein said delivering the solidified material into the molding cavity through the delivery aperture comprises:
injecting the hybrid resin into the molding cavity through the conveying hole at the temperature of 20-40 ℃ and the pressure of 0.05-0.15 MPa.
10. The molding method of any one of claims 4 to 9, wherein said removing the cylinder structure from within the molding cavity of the molding apparatus comprises:
Turning over the forming device, and placing the first cover plate on the assembling platform;
disassembling the second cover plate, the female die splice pieces and the core barrel;
Moving a plurality of said male mold segments inwardly until disengaged from said cylinder structure;
and taking out the column structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410291789.4A CN117962360A (en) | 2024-03-14 | 2024-03-14 | Forming device and forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410291789.4A CN117962360A (en) | 2024-03-14 | 2024-03-14 | Forming device and forming method |
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| CN117962360A true CN117962360A (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410291789.4A Pending CN117962360A (en) | 2024-03-14 | 2024-03-14 | Forming device and forming method |
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| CN (1) | CN117962360A (en) |
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- 2024-03-14 CN CN202410291789.4A patent/CN117962360A/en active Pending
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